int serIn;
int serIn2;

void setup()
{
  Serial.begin(9600);
  Serial1.begin(115200);
  Serial2.begin(115200);
}

void loop()
{
 while (Serial2.available())
 {
  serIn = Serial2.read();
  Serial1.write(serIn);
 }
 while (Serial1.available())
 {
  serIn2 = Serial1.read();
  Serial2.write(serIn2); 
 }
}
